java - What instance of the Object is this method returning? -

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i have written below method need find instance of object returned.also need check if json type or other type returned method work?

public class dynamicobject {      public static void main(string[] args) {         // todo auto-generated method stub          dynamicobject obj = new dynamicobject();          if(obj.testobj() instanceof string)             system.out.println("string");         else if (obj.testobj() instanceof array)             system.out.println("integer array");         else if (obj.testobj() instanceof integer)             system.out.println("integer");       }      private object testobj(){         boolean test = false;         string s= new string("test");         integer in[] = {1,2,3,4,5};         if(test){             return s;         }else{             return in;         }     }  }

what shall instance of case.if run console doesn't show anything.

instanceof should integer[]

else if (obj.testobj() instanceof integer[])             system.out.println("integer array");

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